You can't compare a Marina axle to a Morgan axle. Certainly a Salisbury axle bearing swap is a right game, the hard bit being the breaking of the taper. The Marina half shaft just comes out with the bearing which is an easy swap.
Not sure what I was billed for when the axle on Woodstock was swapped, but the garage did say it was difficult but that a visiting coach mechanic showed them how it was done.
Wasn't aware that I had compared it? Just gave an example of two axle types a simple and a more complex one. Having taught axle overhaul at the BL Training school I am aware of the difference.